Device functionality is provided externally on a hand-held, portable electronic device. In one illustrative embodiment, the hand-held, portable electronic device comprises a transceiver for sending and receiving user communications; one or more processors; a memory; a user interface; a display; and a device body including a device housing. The device housing includes a side circumferential surface on at least two device edges and front, back surfaces. The device housing has a first groove being substantially disposed from the front surface to the back surface across the side circumferential surface of a first device edge of the at least two device edges. And it has a second groove being substantially disposed from the front surface to the back surface across the side circumferential surface of a second device edge of the at least two device edges, different than the first device edge such that the first groove is configured to enable a device functionality of the hand-held portable electronic device by providing an external geometric hardware feature to the device body.